The Effect Hook, useEffect, allows components to perform side effects from a function component.
It is similar to componentDidMount, componentDidUpdate, and componentWillUnmount in React classes, but unified into a single API.
It tells React that the component needs to do something after render.
React will remember the function passed and call it later after performing the DOM updates.
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What does useEffect do? By using this Hook, you tell React that your component needs to do something after render. React will remember the function you passed (we’ll refer to it as our “effect”), and call it later after performing the DOM updates.
Using the Effect Hook – React
useEffect() hook executes side-effects in React components. I am impressed by the expressiveness of React hooks. You can do so much by writing so little.
A Simple Explanation of React.useEffect()
The Effect Hook, useEffect , adds the ability to perform side effects from a function component. It serves the same purpose as componentDidMount , componentDidUpdate , and componentWillUnmount in React classes, but unified into a single API.
Hooks at a Glance – React
That’s what allows React to correctly preserve the state of Hooks between multiple useState and useEffect calls. (If you’re curious, we’ll explain this ...
Rules of Hooks – React
with useEffect . Make sure to read it to the end! It’s not as long as this one.  means the effect doesn’t use any value that participates in React data ...
A Complete Guide to useEffect — Overreacted
如果你熟悉 React class 的生命周期函数，你可以把 useEffect Hook 看做 componentDidMount ， componentDidUpdate 和 componentWillUnmount ...
使用 Effect Hook – React
Each call to a Hook gets isolated state. Because we call useFriendStatus directly, from React’s point of view our component just calls useState and useEffect ...
Building Your Own Hooks – React